Objective: The purpose of the present research is to examine instructing anger management skills on mothers of educable mentally retarded and slow learner children. Method: The design of this study is quasi-experimental with pretest-posttest and control group. This study was conducted on 46 mothers who were assigned equally into experimental and control groups. The anger management training was implemented on experimental group in seven sessions, 2 hours each. Data were collected utilizing two questionnaires: Anger Evaluation Scale and Multidimensional Anger Inventory. Results: An analysis of covariance was used for this research. Findings showed the benefits of anger management training as they follow: intensity and frequency of anger decreased and the use of anger control strategies increased. Conclusion: The effectiveness of anger management techniques is emphasized. Finally, the implications of the study, limitations and suggestions for future research are discussed.